In 2151, the starshipEnterprise NX-01 and a Vulcan civilian transport vessel, the Vahklas, completed a survey of the nebula. The crew of the vessels found that it was actually more than 8 billion kilometers in diameter, not 6.5 billion. They also noted over twenty million cubic meters of disodium and traces of ethylchlorate in the nebula. Enterprise intended to send back the new information to help revise the astronomy books. (ENT: "Fusion")